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THREAT OPS › Threat News › [NVD] CVE-2026-66402 (CRITICAL 9.8) — FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains multiple TLS certificate identity validation weaknesses in tls_verify_certificate(), tls_match_hostname(), and x509_utils_get_dns_names(). Because FreeRDP performs custom Common Name and DNS SAN string matching instead

[NVD] CVE-2026-66402 (CRITICAL 9.8) — FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains multiple TLS certificate identity validation weaknesses in tls_verify_certificate(), tls_match_hostname(), and x509_utils_get_dns_names(). Because FreeRDP performs custom Common Name and DNS SAN string matching instead

mednvdPublished 2026-08-01

CVE-2026-66402 CVSS: 9.8 CRITICAL Published: 2026-08-01T13:16:57.487

FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains multiple TLS certificate identity validation weaknesses in tls_verify_certificate(), tls_match_hostname(), and x509_utils_get_dns_names(). Because FreeRDP performs custom Common Name and DNS SAN string matching instead of using OpenSSL's length-aware identity validatio

Indicators of compromise

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-66402